Hi KLilley,
Thank you for your interest in Syncfusion products.
SplitCell ExampleYou can split the cells by using the following code snippet:
[C#]
sheet.Range["A1"].Text = "split cells";
// Merge
sheet.Range["A1:A3"].Merge();
Please refer the sample in the below link which illustrates the above:
http://websamples.syncfusion.com/samples/XlsIO.Web/6.1.0.34/F71953/main.htmPlease try running the above sample and let me know if this helps.
Regards,
G.Yavana